Massive cyber attack creates chaos around the world

Businesses around the world are boosting their cyber defences this morning after cyber thieves hacked computers in 99 countries on the weekend in what's been described as the biggest attack of its kind in history.

An estimated 75,000 computers at hospitals, schools, banks and leading companies and organisations including the Russian Interior Ministry and Britain's National Health Service were infected with malicious software.

The cyberattackers demanded a ransom payment of $300 or more in exchange for the devices to be unlocked.

But it's feared the virus, dubbed WannaCry, could again wreak fresh havoc when employees log back on today.